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Questions & Answers about Kirja on repussa.
Why does repussa only have one p when the word for backpack is reppu?
This is a rule called consonant gradation. When you add certain endings like -ssa, it "closes" the syllable. This causes strong double consonants to weaken into a single consonant. So, the double pp in reppu drops to a single p, making the stem repu- before adding the ending: repussa.
What does the -ssa ending do in this sentence?
The -ssa ending means "in" or "inside" something (known as the inessive case). It attaches directly to the end of the word, turning "backpack" (reppu) into "in the backpack" (repussa).
Why is the ending -ssa instead of -ssä here?
This is due to vowel harmony. The word reppu contains the vowel u, which is a "back" vowel. (The vowel e is neutral and doesn't change the rule). Because there is a back vowel in the word, the ending must also use the back vowel a, giving us -ssa.
How do we know it translates to "the book" and "the backpack" if there are no words for "the"?
Finnish does not have articles like "a" or "the". You have to figure it out from context and word order. Putting kirja at the start of the sentence usually implies it is a specific, known thing we are talking about, which is why "the book" is the most natural English translation here.